./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/list-properties/alternating_list-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 9bd2c7ff Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_488491a2-c0ab-4f44-a6a7-eb6e2d00f235/bin/uautomizer-verify-uCwYo4JHxu/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_488491a2-c0ab-4f44-a6a7-eb6e2d00f235/bin/uautomizer-verify-uCwYo4JHxu/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_488491a2-c0ab-4f44-a6a7-eb6e2d00f235/bin/uautomizer-verify-uCwYo4JHxu/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_488491a2-c0ab-4f44-a6a7-eb6e2d00f235/bin/uautomizer-verify-uCwYo4JHxu/config/AutomizerReach.xml -i ../../sv-benchmarks/c/list-properties/alternating_list-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_488491a2-c0ab-4f44-a6a7-eb6e2d00f235/bin/uautomizer-verify-uCwYo4JHxu/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_488491a2-c0ab-4f44-a6a7-eb6e2d00f235/bin/uautomizer-verify-uCwYo4JHxu --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash f533383f211897ea0c402e211f6c19321d99a2ee7c27b850c3f29a2cf1ec1863 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-9bd2c7f [2023-11-19 07:59:37,668 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-19 07:59:37,748 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_488491a2-c0ab-4f44-a6a7-eb6e2d00f235/bin/uautomizer-verify-uCwYo4JHxu/config/svcomp-Reach-32bit-Automizer_Default.epf [2023-11-19 07:59:37,753 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-19 07:59:37,754 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-19 07:59:37,781 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-19 07:59:37,781 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-19 07:59:37,782 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-19 07:59:37,783 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-19 07:59:37,783 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-19 07:59:37,784 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-19 07:59:37,785 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-19 07:59:37,786 INFO L153 SettingsManager]: * Use SBE=true [2023-11-19 07:59:37,786 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-19 07:59:37,787 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-19 07:59:37,788 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-19 07:59:37,788 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-19 07:59:37,789 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-19 07:59:37,790 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-19 07:59:37,790 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-19 07:59:37,791 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-19 07:59:37,796 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-19 07:59:37,796 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-19 07:59:37,797 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-19 07:59:37,800 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-19 07:59:37,801 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-19 07:59:37,802 INFO L153 SettingsManager]: * Size of a code block=SequenceOfStatements [2023-11-19 07:59:37,802 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-19 07:59:37,803 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 07:59:37,803 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-19 07:59:37,805 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-19 07:59:37,805 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-19 07:59:37,805 INFO L153 SettingsManager]: * Trace refinement strategy=CAMEL [2023-11-19 07:59:37,805 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-19 07:59:37,806 INFO L153 SettingsManager]: * Automaton type used in concurrency analysis=PETRI_NET [2023-11-19 07:59:37,806 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-19 07:59:37,806 INFO L153 SettingsManager]: * Order on configurations for Petri net unfoldings=DBO [2023-11-19 07:59:37,806 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-19 07:59:37,807 INFO L153 SettingsManager]: * Independence relation used for large block encoding in concurrent analysis=SYNTACTIC [2023-11-19 07:59:37,807 INFO L153 SettingsManager]: * Looper check in Petri net analysis=SEMANTIC WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_488491a2-c0ab-4f44-a6a7-eb6e2d00f235/bin/uautomizer-verify-uCwYo4JHxu/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_488491a2-c0ab-4f44-a6a7-eb6e2d00f235/bin/uautomizer-verify-uCwYo4JHxu Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> f533383f211897ea0c402e211f6c19321d99a2ee7c27b850c3f29a2cf1ec1863 [2023-11-19 07:59:38,094 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-19 07:59:38,127 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-19 07:59:38,130 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-19 07:59:38,132 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-19 07:59:38,132 INFO L274 PluginConnector]: CDTParser initialized [2023-11-19 07:59:38,134 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_488491a2-c0ab-4f44-a6a7-eb6e2d00f235/bin/uautomizer-verify-uCwYo4JHxu/../../sv-benchmarks/c/list-properties/alternating_list-2.i [2023-11-19 07:59:41,236 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-19 07:59:41,610 INFO L384 CDTParser]: Found 1 translation units. [2023-11-19 07:59:41,611 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_488491a2-c0ab-4f44-a6a7-eb6e2d00f235/sv-benchmarks/c/list-properties/alternating_list-2.i [2023-11-19 07:59:41,624 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_488491a2-c0ab-4f44-a6a7-eb6e2d00f235/bin/uautomizer-verify-uCwYo4JHxu/data/f3f9f225d/e61ddeb815c44b97bb4500ca9c0fac9b/FLAG059e62118 [2023-11-19 07:59:41,639 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_488491a2-c0ab-4f44-a6a7-eb6e2d00f235/bin/uautomizer-verify-uCwYo4JHxu/data/f3f9f225d/e61ddeb815c44b97bb4500ca9c0fac9b [2023-11-19 07:59:41,642 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-19 07:59:41,644 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-19 07:59:41,645 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-19 07:59:41,645 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-19 07:59:41,650 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-19 07:59:41,651 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 07:59:41" (1/1) ... [2023-11-19 07:59:41,652 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@33f5d9f4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:59:41, skipping insertion in model container [2023-11-19 07:59:41,653 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 07:59:41" (1/1) ... [2023-11-19 07:59:41,718 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-19 07:59:42,143 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_488491a2-c0ab-4f44-a6a7-eb6e2d00f235/sv-benchmarks/c/list-properties/alternating_list-2.i[23574,23587] [2023-11-19 07:59:42,150 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 07:59:42,161 INFO L202 MainTranslator]: Completed pre-run [2023-11-19 07:59:42,206 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_488491a2-c0ab-4f44-a6a7-eb6e2d00f235/sv-benchmarks/c/list-properties/alternating_list-2.i[23574,23587] [2023-11-19 07:59:42,207 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 07:59:42,241 INFO L206 MainTranslator]: Completed translation [2023-11-19 07:59:42,241 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:59:42 WrapperNode [2023-11-19 07:59:42,242 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-19 07:59:42,243 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-19 07:59:42,244 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-19 07:59:42,244 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-19 07:59:42,252 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:59:42" (1/1) ... [2023-11-19 07:59:42,266 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:59:42" (1/1) ... [2023-11-19 07:59:42,289 INFO L138 Inliner]: procedures = 124, calls = 23, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 86 [2023-11-19 07:59:42,289 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-19 07:59:42,290 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-19 07:59:42,290 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-19 07:59:42,291 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-19 07:59:42,300 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:59:42" (1/1) ... [2023-11-19 07:59:42,300 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:59:42" (1/1) ... [2023-11-19 07:59:42,304 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:59:42" (1/1) ... [2023-11-19 07:59:42,305 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:59:42" (1/1) ... [2023-11-19 07:59:42,312 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:59:42" (1/1) ... [2023-11-19 07:59:42,316 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:59:42" (1/1) ... [2023-11-19 07:59:42,318 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:59:42" (1/1) ... [2023-11-19 07:59:42,320 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:59:42" (1/1) ... [2023-11-19 07:59:42,323 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-19 07:59:42,324 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-19 07:59:42,324 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-19 07:59:42,325 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-19 07:59:42,326 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:59:42" (1/1) ... [2023-11-19 07:59:42,332 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 07:59:42,351 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_488491a2-c0ab-4f44-a6a7-eb6e2d00f235/bin/uautomizer-verify-uCwYo4JHxu/z3 [2023-11-19 07:59:42,370 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_488491a2-c0ab-4f44-a6a7-eb6e2d00f235/bin/uautomizer-verify-uCwYo4JHxu/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-19 07:59:42,404 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_488491a2-c0ab-4f44-a6a7-eb6e2d00f235/bin/uautomizer-verify-uCwYo4JHxu/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-19 07:59:42,424 INFO L130 BoogieDeclarations]: Found specification of procedure myexit [2023-11-19 07:59:42,424 INFO L138 BoogieDeclarations]: Found implementation of procedure myexit [2023-11-19 07:59:42,424 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-19 07:59:42,425 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-19 07:59:42,425 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-19 07:59:42,425 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-19 07:59:42,425 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-19 07:59:42,426 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-19 07:59:42,426 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-19 07:59:42,426 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-19 07:59:42,426 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-19 07:59:42,426 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-19 07:59:42,521 INFO L236 CfgBuilder]: Building ICFG [2023-11-19 07:59:42,523 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-19 07:59:42,569 INFO L767 $ProcedureCfgBuilder]: dead code at ProgramPoint myexitFINAL: assume true; [2023-11-19 07:59:42,738 INFO L277 CfgBuilder]: Performing block encoding [2023-11-19 07:59:42,746 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-19 07:59:42,746 INFO L302 CfgBuilder]: Removed 3 assume(true) statements. [2023-11-19 07:59:42,750 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 07:59:42 BoogieIcfgContainer [2023-11-19 07:59:42,750 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-19 07:59:42,752 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-19 07:59:42,752 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-19 07:59:42,756 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-19 07:59:42,756 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 07:59:41" (1/3) ... [2023-11-19 07:59:42,757 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5146d7c9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 07:59:42, skipping insertion in model container [2023-11-19 07:59:42,757 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 07:59:42" (2/3) ... [2023-11-19 07:59:42,758 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5146d7c9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 07:59:42, skipping insertion in model container [2023-11-19 07:59:42,758 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 07:59:42" (3/3) ... [2023-11-19 07:59:42,759 INFO L112 eAbstractionObserver]: Analyzing ICFG alternating_list-2.i [2023-11-19 07:59:42,779 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-19 07:59:42,780 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-19 07:59:42,825 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-19 07:59:42,832 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=PETRI_NET, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopHeads, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@6607fd0, mLbeIndependenceSettings=[IndependenceType=SYNTACTIC, AbstractionType=NONE, UseConditional=, UseSemiCommutativity=, Solver=, SolverTimeout=] [2023-11-19 07:59:42,832 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-19 07:59:42,838 INFO L276 IsEmpty]: Start isEmpty. Operand has 30 states, 26 states have (on average 1.5) internal successors, (39), 28 states have internal predecessors, (39), 2 states have call successors, (2), 1 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 07:59:42,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-19 07:59:42,844 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 07:59:42,844 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 07:59:42,845 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 07:59:42,849 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 07:59:42,849 INFO L85 PathProgramCache]: Analyzing trace with hash 930969484, now seen corresponding path program 1 times [2023-11-19 07:59:42,858 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 07:59:42,858 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1002029122] [2023-11-19 07:59:42,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:59:42,859 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 07:59:43,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:59:43,098 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 07:59:43,098 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 07:59:43,099 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1002029122] [2023-11-19 07:59:43,099 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1002029122] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 07:59:43,099 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 07:59:43,100 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-19 07:59:43,101 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [69761489] [2023-11-19 07:59:43,102 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 07:59:43,113 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-11-19 07:59:43,115 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 07:59:43,162 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-11-19 07:59:43,163 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-19 07:59:43,165 INFO L87 Difference]: Start difference. First operand has 30 states, 26 states have (on average 1.5) internal successors, (39), 28 states have internal predecessors, (39), 2 states have call successors, (2), 1 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 07:59:43,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 07:59:43,192 INFO L93 Difference]: Finished difference Result 46 states and 63 transitions. [2023-11-19 07:59:43,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-11-19 07:59:43,195 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2023-11-19 07:59:43,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 07:59:43,203 INFO L225 Difference]: With dead ends: 46 [2023-11-19 07:59:43,204 INFO L226 Difference]: Without dead ends: 19 [2023-11-19 07:59:43,208 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-19 07:59:43,214 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 07:59:43,216 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 07:59:43,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2023-11-19 07:59:43,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2023-11-19 07:59:43,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 18 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 07:59:43,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 23 transitions. [2023-11-19 07:59:43,252 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 23 transitions. Word has length 11 [2023-11-19 07:59:43,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 07:59:43,254 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 23 transitions. [2023-11-19 07:59:43,254 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 5.5) internal successors, (11), 2 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 07:59:43,254 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 23 transitions. [2023-11-19 07:59:43,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-11-19 07:59:43,256 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 07:59:43,256 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 07:59:43,257 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-19 07:59:43,257 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 07:59:43,258 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 07:59:43,258 INFO L85 PathProgramCache]: Analyzing trace with hash 1797355599, now seen corresponding path program 1 times [2023-11-19 07:59:43,258 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 07:59:43,259 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [219339603] [2023-11-19 07:59:43,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:59:43,260 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 07:59:43,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:59:43,488 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 07:59:43,489 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 07:59:43,489 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [219339603] [2023-11-19 07:59:43,490 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [219339603] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 07:59:43,490 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 07:59:43,491 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-19 07:59:43,491 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1592361264] [2023-11-19 07:59:43,491 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 07:59:43,493 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 07:59:43,493 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 07:59:43,494 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 07:59:43,495 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 07:59:43,496 INFO L87 Difference]: Start difference. First operand 19 states and 23 transitions. Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 07:59:43,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 07:59:43,541 INFO L93 Difference]: Finished difference Result 47 states and 57 transitions. [2023-11-19 07:59:43,542 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 07:59:43,543 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2023-11-19 07:59:43,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 07:59:43,544 INFO L225 Difference]: With dead ends: 47 [2023-11-19 07:59:43,544 INFO L226 Difference]: Without dead ends: 32 [2023-11-19 07:59:43,544 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 07:59:43,547 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 12 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 4 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 8 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 4 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 07:59:43,550 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 39 Invalid, 8 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 4 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 07:59:43,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2023-11-19 07:59:43,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 29. [2023-11-19 07:59:43,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.2142857142857142) internal successors, (34), 28 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 07:59:43,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 34 transitions. [2023-11-19 07:59:43,563 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 34 transitions. Word has length 12 [2023-11-19 07:59:43,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 07:59:43,563 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 34 transitions. [2023-11-19 07:59:43,563 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 07:59:43,564 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 34 transitions. [2023-11-19 07:59:43,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-11-19 07:59:43,564 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 07:59:43,565 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 07:59:43,565 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-19 07:59:43,565 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 07:59:43,567 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 07:59:43,567 INFO L85 PathProgramCache]: Analyzing trace with hash 1797348655, now seen corresponding path program 1 times [2023-11-19 07:59:43,567 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 07:59:43,568 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [563546064] [2023-11-19 07:59:43,568 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:59:43,568 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 07:59:43,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 07:59:43,903 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 07:59:43,904 INFO L136 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2023-11-19 07:59:43,904 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [563546064] [2023-11-19 07:59:43,905 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [563546064] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 07:59:43,907 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 07:59:43,907 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-19 07:59:43,907 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [451783762] [2023-11-19 07:59:43,908 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 07:59:43,909 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-19 07:59:43,910 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2023-11-19 07:59:43,911 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-19 07:59:43,911 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-19 07:59:43,912 INFO L87 Difference]: Start difference. First operand 29 states and 34 transitions. Second operand has 5 states, 5 states have (on average 2.4) internal successors, (12), 5 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 07:59:44,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 07:59:44,030 INFO L93 Difference]: Finished difference Result 57 states and 65 transitions. [2023-11-19 07:59:44,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-19 07:59:44,031 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 5 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2023-11-19 07:59:44,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 07:59:44,032 INFO L225 Difference]: With dead ends: 57 [2023-11-19 07:59:44,032 INFO L226 Difference]: Without dead ends: 42 [2023-11-19 07:59:44,033 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2023-11-19 07:59:44,034 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 12 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 07:59:44,035 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 56 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 07:59:44,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2023-11-19 07:59:44,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 31. [2023-11-19 07:59:44,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 30 states have (on average 1.2) internal successors, (36), 30 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 07:59:44,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 36 transitions. [2023-11-19 07:59:44,044 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 36 transitions. Word has length 12 [2023-11-19 07:59:44,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 07:59:44,045 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 36 transitions. [2023-11-19 07:59:44,045 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.4) internal successors, (12), 5 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 07:59:44,045 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 36 transitions. [2023-11-19 07:59:44,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-11-19 07:59:44,046 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 07:59:44,046 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 07:59:44,047 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-19 07:59:44,047 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 07:59:44,048 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 07:59:44,048 INFO L85 PathProgramCache]: Analyzing trace with hash -1890563654, now seen corresponding path program 1 times [2023-11-19 07:59:44,048 INFO L118 FreeRefinementEngine]: Executing refinement strategy CAMEL [2023-11-19 07:59:44,049 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1639884687] [2023-11-19 07:59:44,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 07:59:44,049 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 07:59:44,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-11-19 07:59:44,080 INFO L356 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2023-11-19 07:59:44,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2023-11-19 07:59:44,172 INFO L130 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2023-11-19 07:59:44,173 INFO L360 BasicCegarLoop]: Counterexample is feasible [2023-11-19 07:59:44,174 INFO L805 garLoopResultBuilder]: Registering result UNSAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2023-11-19 07:59:44,176 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-19 07:59:44,179 INFO L445 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1] [2023-11-19 07:59:44,183 INFO L178 ceAbstractionStarter]: Computing trace abstraction results [2023-11-19 07:59:44,203 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~mem7 could not be translated [2023-11-19 07:59:44,204 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~mem8 could not be translated [2023-11-19 07:59:44,225 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 19.11 07:59:44 BoogieIcfgContainer [2023-11-19 07:59:44,225 INFO L131 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2023-11-19 07:59:44,227 INFO L112 PluginConnector]: ------------------------Witness Printer---------------------------- [2023-11-19 07:59:44,227 INFO L270 PluginConnector]: Initializing Witness Printer... [2023-11-19 07:59:44,227 INFO L274 PluginConnector]: Witness Printer initialized [2023-11-19 07:59:44,228 INFO L184 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 07:59:42" (3/4) ... [2023-11-19 07:59:44,229 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2023-11-19 07:59:44,241 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~mem7 could not be translated [2023-11-19 07:59:44,241 WARN L1572 BoogieBacktranslator]: Unfinished Backtranslation: IdentifierExpression #t~mem8 could not be translated [2023-11-19 07:59:44,282 INFO L149 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_488491a2-c0ab-4f44-a6a7-eb6e2d00f235/bin/uautomizer-verify-uCwYo4JHxu/witness.graphml [2023-11-19 07:59:44,282 INFO L131 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2023-11-19 07:59:44,283 INFO L158 Benchmark]: Toolchain (without parser) took 2639.29ms. Allocated memory is still 140.5MB. Free memory was 95.4MB in the beginning and 104.1MB in the end (delta: -8.7MB). There was no memory consumed. Max. memory is 16.1GB. [2023-11-19 07:59:44,283 INFO L158 Benchmark]: CDTParser took 0.25ms. Allocated memory is still 104.9MB. Free memory is still 54.3MB. There was no memory consumed. Max. memory is 16.1GB. [2023-11-19 07:59:44,284 INFO L158 Benchmark]: CACSL2BoogieTranslator took 596.93ms. Allocated memory is still 140.5MB. Free memory was 95.1MB in the beginning and 77.9MB in the end (delta: 17.1MB). Peak memory consumption was 16.8MB. Max. memory is 16.1GB. [2023-11-19 07:59:44,284 INFO L158 Benchmark]: Boogie Procedure Inliner took 46.15ms. Allocated memory is still 140.5MB. Free memory was 77.9MB in the beginning and 76.1MB in the end (delta: 1.9MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2023-11-19 07:59:44,284 INFO L158 Benchmark]: Boogie Preprocessor took 33.28ms. Allocated memory is still 140.5MB. Free memory was 76.1MB in the beginning and 74.5MB in the end (delta: 1.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2023-11-19 07:59:44,285 INFO L158 Benchmark]: RCFGBuilder took 425.94ms. Allocated memory is still 140.5MB. Free memory was 74.5MB in the beginning and 99.9MB in the end (delta: -25.5MB). Peak memory consumption was 6.8MB. Max. memory is 16.1GB. [2023-11-19 07:59:44,285 INFO L158 Benchmark]: TraceAbstraction took 1473.20ms. Allocated memory is still 140.5MB. Free memory was 99.2MB in the beginning and 106.5MB in the end (delta: -7.2MB). There was no memory consumed. Max. memory is 16.1GB. [2023-11-19 07:59:44,286 INFO L158 Benchmark]: Witness Printer took 55.50ms. Allocated memory is still 140.5MB. Free memory was 106.2MB in the beginning and 104.1MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2023-11-19 07:59:44,288 INFO L338 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25ms. Allocated memory is still 104.9MB. Free memory is still 54.3MB. There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 596.93ms. Allocated memory is still 140.5MB. Free memory was 95.1MB in the beginning and 77.9MB in the end (delta: 17.1MB). Peak memory consumption was 16.8MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 46.15ms. Allocated memory is still 140.5MB. Free memory was 77.9MB in the beginning and 76.1MB in the end (delta: 1.9MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 33.28ms. Allocated memory is still 140.5MB. Free memory was 76.1MB in the beginning and 74.5MB in the end (delta: 1.6MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * RCFGBuilder took 425.94ms. Allocated memory is still 140.5MB. Free memory was 74.5MB in the beginning and 99.9MB in the end (delta: -25.5MB). Peak memory consumption was 6.8MB. Max. memory is 16.1GB. * TraceAbstraction took 1473.20ms. Allocated memory is still 140.5MB. Free memory was 99.2MB in the beginning and 106.5MB in the end (delta: -7.2MB). There was no memory consumed. Max. memory is 16.1GB. * Witness Printer took 55.50ms. Allocated memory is still 140.5MB. Free memory was 106.2MB in the beginning and 104.1MB in the end (delta: 2.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~mem7 could not be translated - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~mem8 could not be translated - GenericResult: Unfinished Backtranslation The program execution was not completely translated back. - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~mem7 could not be translated - GenericResult: Unfinished Backtranslation Unfinished Backtranslation: IdentifierExpression #t~mem8 could not be translated - GenericResult: Unfinished Backtranslation The program execution was not completely translated back. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - CounterExampleResult [Line: 573]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L532] int flag = 1; [L533] List a = (List) malloc(sizeof(struct node)); [L534] COND FALSE !(a == 0) VAL [a={-1:0}, flag=1] [L535] List t; [L536] List p = a; VAL [a={-1:0}, flag=1, p={-1:0}] [L537] COND TRUE __VERIFIER_nondet_int() [L538] COND TRUE \read(flag) [L539] p->h = 2 [L540] flag = 0 VAL [a={-1:0}, flag=0, p={-1:0}] [L545] t = (List) malloc(sizeof(struct node)) [L546] COND FALSE !(t == 0) VAL [a={-1:0}, flag=0, p={-1:0}, t={-2:0}] [L547] p->n = t [L548] EXPR p->n [L548] p = p->n [L537] COND FALSE !(__VERIFIER_nondet_int()) [L550] p->h = 3 [L551] p = a [L552] flag = 1 VAL [a={-1:0}, flag=1, p={-1:0}, t={-2:0}] [L553] EXPR p->h VAL [a={-1:0}, flag=1, p={-1:0}, t={-2:0}] [L553] COND TRUE p->h != 3 [L554] COND TRUE \read(flag) [L555] flag = 0 [L556] EXPR p->h VAL [a={-1:0}, flag=0, p={-1:0}, t={-2:0}] [L556] COND TRUE p->h != 1 [L573] reach_error() VAL [a={-1:0}, flag=0, p={-1:0}, t={-2:0}] - StatisticsResult: Ultimate Automizer benchmark data CFG has 2 procedures, 31 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 1.4s, OverallIterations: 4, TraceHistogramMax: 2, PathProgramHistogramMax: 1, EmptinessCheckTime: 0.0s, AutomataDifference: 0.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 24 SdHoareTripleChecker+Valid, 0.1s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 24 mSDsluCounter, 132 SdHoareTripleChecker+Invalid, 0.1s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 52 mSDsCounter, 6 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 38 IncrementalHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 6 mSolverCounterUnsat, 80 mSDtfsCounter, 38 mSolverCounterSat, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 12 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=31occurred in iteration=3, InterpolantAutomatonStates: 10, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 3 MinimizatonAttempts, 14 StatesRemovedByMinimization, 2 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.5s InterpolantComputationTime, 53 NumberOfCodeBlocks, 53 NumberOfCodeBlocksAsserted, 4 NumberOfCheckSat, 32 ConstructedInterpolants, 0 QuantifiedInterpolants, 64 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 3 InterpolantComputations, 3 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! [2023-11-19 07:59:44,314 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_488491a2-c0ab-4f44-a6a7-eb6e2d00f235/bin/uautomizer-verify-uCwYo4JHxu/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Ended with exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE